Ray B
AH legend
Attached is a photograph of 2 bolt faces. Left is for a 458Win Mag, Right is for a 404 Jeffery, altered by PO Ackley. The 458 face within the rim is .535"; the 404 is .555", The radius for the 404 is .01" greater. The real noticeable difference is in the extractor. The 404 has a considerable portion removed. The extractor appears to be the main difference in suitability of the action for .532 cartridges. Since the extractor can be replaced and milled to the desired cartridge, I would not hesitate to get this action if I were considering a build.
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